A glacis in military engineering is an artificial slope as part of a medieval castle or in early modern fortresses. They may be constructed of earth as a temporary structure or of stone in more permanent structure. More generally, a glacis is any slope, natural or artificial, which fulfils the above requirements. The etymology of this French word suggests a slope made dangerous with ice, hence the relationship with glacier.
A defensive wall is a fortification usually used to protect a city, town or other settlement from potential aggressors. The walls can range from simple palisades or earthworks to extensive military fortifications with towers, bastions and gates for access to the city. From ancient to modern times, they were used to enclose settlements. Generally, these are referred to as city walls or town walls, although there were also walls, such as the Great Wall of China, Walls of Benin, Hadrian's Wall, Anastasian Wall, and the Atlantic Wall, which extended far beyond the borders of a city and were used to enclose regions or mark territorial boundaries. In mountainous terrain, defensive walls such as letzis were used in combination with castles to seal valleys from potential attack. Beyond their defensive utility, many walls also had important symbolic functions – representing the status and independence of the communities they embraced.
A fortification is a military construction designed for the defense of territories in warfare, and is used to establish rule in a region during peacetime. The term is derived from Latin fortis ("strong") and facere.
A bastion or bulwark is a structure projecting outward from the curtain wall of a fortification, most commonly angular in shape and positioned at the corners of the fort. The fully developed bastion consists of two faces and two flanks, with fire from the flanks being able to protect the curtain wall and the adjacent bastions. Compared with the medieval fortified towers they replaced, bastion fortifications offered a greater degree of passive resistance and more scope for ranged defence in the age of gunpowder artillery. As military architecture, the bastion is one element in the style of fortification dominant from the mid 16th to mid 19th centuries.
St Helier is the capital of Jersey, the largest of the Channel Islands in the English Channel. St Helier has a population of 35,822 – over one-third of the total population of Jersey – and is one of the twelve parishes of Jersey. The town of St Helier is the largest settlement and only town of Jersey. The town consists of the built-up areas of St Helier, including First Tower, and parts of the parishes of St Saviour and St Clement, with further suburbs in surrounding parishes. The greater part of St Helier is rural.
Redan is a feature of fortifications. It is a work in a V-shaped salient angle towards an expected attack. It can be made from earthworks or other material.
Tilbury Fort, also known historically as the Thermitage Bulwark and the West Tilbury Blockhouse, is an artillery fort on the north bank of the River Thames in England. The earliest version of the fort, comprising a small blockhouse with artillery covering the river, was constructed by King Henry VIII to protect London against attack from France as part of his Device programme. It was reinforced during the 1588 Spanish Armada invasion scare, after which it was reinforced with earthwork bastion, and Parliamentary forces used it to help secure the capital during the English Civil War of the 1640s. Following naval raids during the Anglo-Dutch Wars, the fort was enlarged by Sir Bernard de Gomme from 1670 onwards to form a star-shaped defensive work, with angular bastions, water-filled moats and two lines of guns facing onto the river.
The Western Heights of Dover are one of the most impressive fortifications in Britain. They comprise a series of forts, strong points and ditches, designed to protect the country from invasion. They were created in the 18th and 19th centuries to augment the existing defences and protect the key port of Dover from both seaward and landward attack; by the start of the 20th century Dover Western Heights was collectively reputed to be the 'strongest and most elaborate' fortification in the country. The Army finally withdrew from the Heights in 1956–61; they are now a local nature reserve.
Slough Fort is a small artillery fort that was built at Allhallows-on-Sea in the north of the Hoo Peninsula in Kent. Constructed in 1867, the D-shaped fort was intended to guard a vulnerable stretch of the River Thames against possible enemy landings during a period of tension with France. Its seven casemates initially accommodated rifled breech loading guns, which were replaced by the turn of the century by more powerful breech-loaders on disappearing carriages, mounted in concrete wing batteries on either side of the fort. It was likely one of the smallest of the forts constructed as a result of the 1860s invasion scare.
Fort Nelson, in the civil parish of Boarhunt in the English county of Hampshire, is one of five defensive forts built on the summit of Portsdown Hill in the 1860s, overlooking the important naval base of Portsmouth. It is now part of the Royal Armouries, housing their collection of artillery, and a Grade I Listed Building.
A bastion fort or trace italienne is a fortification in a style that evolved during the early modern period of gunpowder when the cannon came to dominate the battlefield. It was first seen in the mid-fifteenth century in Italy. Some types, especially when combined with ravelins and other outworks, resembled the related star fort of the same era.
The Vingtaine de la Ville is one of the six vingtaines of Saint Helier in Jersey, and roughly corresponds to the historic town centre and harbours. It is divided into two cantons:
Elizabeth Castle is a castle and tourist attraction, on a tidal island within the parish of Saint Helier, Jersey. Construction was started in the 16th century when the power of the cannon meant that the existing stronghold at Mont Orgueil was insufficient to defend the Island and the port of St. Helier was vulnerable to attack by ships armed with cannons.
The Fortifications of Vauban is a UNESCO World Heritage Site made up of 12 groups of fortified buildings and sites along the borders of France. They were designed by renowned military architect Sébastien Le Prestre de Vauban (1633–1707) during the reign of King Louis XIV. These sites include a variety of fortifications, ranging from citadels, to mountain batteries and sea fortifications, to bastion walls and towers. In addition, the site includes cities built from scratch by Vauban and communication towers. These sites were chosen because they exemplify Vauban's work, bearing witness to the influence of his designs on military and civilian engineering on a global scale from the 17th century to the 20th century.
The Ahmednagar Fort is a fort located near to the Bhingar Nala near Ahmednagar in Maharashtra. It was the headquarters of the Ahmednagar Sultanate. In 1803, it was taken by the British during the Second Anglo-Maratha War. It was used as a prison during the British Raj. Currently, the fort is under the administration of the Armoured Corps of the Indian Army.
Fort Rowner is one of the Palmerston Forts, in Gosport, England.
Streets in the British Overseas Territory of Gibraltar are represented by road signs as in the United Kingdom. As of 2007, Gibraltar has a network of 29 kilometres (18 mi) of roads.
The Lines of Contravallation of Gibraltar, known in English as the "Spanish Lines", were a set of fortifications built by the Spanish across the northern part of the isthmus linking Spain with Gibraltar. They later gave their name to the Spanish town of La Línea de la Concepción. The Lines were constructed after 1730 to establish a defensive barrier across the peninsula, with the aim of preventing any British incursions, and to serve as a base for fresh Spanish attempts to retake Gibraltar. They played an important role in the Great Siege of Gibraltar between 1779 and 1783 when they supported the unsuccessful French and Spanish assault on the British-held fortress. The siege was ended after the lines of contravallation were attacked by British and Dutch forces under the command of the Governor of Gibraltar, General Augustus Eliot. The attack caused the Spanish forces to retreat and abandon the fortifications and the combined British led forces virtually destroyed all the Spanish gun batteries and the enemy cannon and munitions either captured or destroyed. This attack is still commemorated to this day and is known as 'Sortie Day'.
The Matara Fort was built in 1560 by the Portuguese and was substantially re-built by the Dutch in 1640, following the capture of Galle. The fort, which consists of a large stone rampart, occupies the promontory, which separates the Niwala Ganga (River) lagoon and the ocean.
